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ACQUISITION OF MGE Part 3 - Preliminary Fair Value of Assets Acquired and Liabilities Assumed (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 01, 2013 Missouri Gas Energy (MGE) [Member]
--- | --- | --- | ---
Assets: |  |  |
Utility plant |  |  | $ 671,793
Non-utility property |  |  | 238
Other investments |  |  | 3,096
Goodwill | 247,078 | 0 | 247,078
Other Property and Investments |  |  | 922,205
Accounts receivable: |  |  |
Utility |  |  | 19,963
Other |  |  | 6,119
Delayed customer billings |  |  | 10,701
Inventories: |  |  |
Natural gas stored underground |  |  | 58,679
Materials and supplies at average cost |  |  | 3,988
Prepayments and other |  |  | 487
Total Current Assets |  |  | 99,937
Deferred Charges: |  |  |
Regulatory assets |  |  | 84,014
Other |  |  | 4,928
Total Deferred Charges |  |  | 88,942
Total Assets Acquired |  |  | 1,111,084
Liabilities: |  |  |
Accounts payable |  |  | 20,154
Wages and compensation accrued |  |  | 5,088
Customer deposits |  |  | 8,362
Interest accrued |  |  | 183
Taxes accrued |  |  | 17,197
Other |  |  | 12,620
Total Current Liabilities |  |  | 63,604
Pension and postretirement benefit costs |  |  | 24,466
Asset retirement obligations |  |  | 32,056
Regulatory liabilities |  |  | 2,249
Regulatory liabilities |  |  | 13,709
Total Deferred Credits and Other Liabilities |  |  | 72,480
Total Liabilities Assumed |  |  | 136,084
Net Assets Acquired |  |  | $ 975,000

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